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Q.

Find the square root of 225 by prime factorisation.


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a

25

b

15

c

35

d

45  

answer is B.

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Detailed Solution

Given number is 225.
Writing the prime factors of 225.
225=3×3×5×5
Taking square root,
225=3×3×5×5
⇒225=32×52
⇒225=3×5=15
Thus, the square root of 225 by prime factorization is 15.
Therefore, option (2) is correct.
 
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